Line data Source code
1 : /* SPDX-License-Identifier: GPL-2.0 OR MIT */
2 :
3 : /*
4 : * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
5 : * Copyright 2020 Advanced Micro Devices, Inc.
6 : *
7 : * Permission is hereby granted, free of charge, to any person obtaining a
8 : * copy of this software and associated documentation files (the "Software"),
9 : * to deal in the Software without restriction, including without limitation
10 : * the rights to use, copy, modify, merge, publish, distribute, sublicense,
11 : * and/or sell copies of the Software, and to permit persons to whom the
12 : * Software is furnished to do so, subject to the following conditions:
13 : *
14 : * The above copyright notice and this permission notice shall be included in
15 : * all copies or substantial portions of the Software.
16 : *
17 : * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 : * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 : * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 : * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
21 : * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
22 : * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
23 : * OTHER DEALINGS IN THE SOFTWARE.
24 : *
25 : * Authors: Christian König
26 : */
27 :
28 : #define pr_fmt(fmt) "[TTM DEVICE] " fmt
29 :
30 : #include <linux/mm.h>
31 :
32 : #include <drm/ttm/ttm_device.h>
33 : #include <drm/ttm/ttm_tt.h>
34 : #include <drm/ttm/ttm_placement.h>
35 : #include <drm/ttm/ttm_bo_api.h>
36 :
37 : #include "ttm_module.h"
38 :
39 : /*
40 : * ttm_global_mutex - protecting the global state
41 : */
42 : static DEFINE_MUTEX(ttm_global_mutex);
43 : static unsigned ttm_glob_use_count;
44 : struct ttm_global ttm_glob;
45 : EXPORT_SYMBOL(ttm_glob);
46 :
47 : struct dentry *ttm_debugfs_root;
48 :
49 0 : static void ttm_global_release(void)
50 : {
51 0 : struct ttm_global *glob = &ttm_glob;
52 :
53 0 : mutex_lock(&ttm_global_mutex);
54 0 : if (--ttm_glob_use_count > 0)
55 : goto out;
56 :
57 0 : ttm_pool_mgr_fini();
58 0 : debugfs_remove(ttm_debugfs_root);
59 :
60 0 : __free_page(glob->dummy_read_page);
61 0 : memset(glob, 0, sizeof(*glob));
62 : out:
63 0 : mutex_unlock(&ttm_global_mutex);
64 0 : }
65 :
66 0 : static int ttm_global_init(void)
67 : {
68 0 : struct ttm_global *glob = &ttm_glob;
69 : unsigned long num_pages, num_dma32;
70 : struct sysinfo si;
71 0 : int ret = 0;
72 :
73 0 : mutex_lock(&ttm_global_mutex);
74 0 : if (++ttm_glob_use_count > 1)
75 : goto out;
76 :
77 0 : si_meminfo(&si);
78 :
79 0 : ttm_debugfs_root = debugfs_create_dir("ttm", NULL);
80 0 : if (IS_ERR(ttm_debugfs_root)) {
81 0 : ttm_debugfs_root = NULL;
82 : }
83 :
84 : /* Limit the number of pages in the pool to about 50% of the total
85 : * system memory.
86 : */
87 0 : num_pages = ((u64)si.totalram * si.mem_unit) >> PAGE_SHIFT;
88 0 : num_pages /= 2;
89 :
90 : /* But for DMA32 we limit ourself to only use 2GiB maximum. */
91 0 : num_dma32 = (u64)(si.totalram - si.totalhigh) * si.mem_unit
92 : >> PAGE_SHIFT;
93 0 : num_dma32 = min(num_dma32, 2UL << (30 - PAGE_SHIFT));
94 :
95 0 : ttm_pool_mgr_init(num_pages);
96 0 : ttm_tt_mgr_init(num_pages, num_dma32);
97 :
98 0 : glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
99 :
100 0 : if (unlikely(glob->dummy_read_page == NULL)) {
101 : ret = -ENOMEM;
102 : goto out;
103 : }
104 :
105 0 : INIT_LIST_HEAD(&glob->device_list);
106 0 : atomic_set(&glob->bo_count, 0);
107 :
108 0 : debugfs_create_atomic_t("buffer_objects", 0444, ttm_debugfs_root,
109 : &glob->bo_count);
110 : out:
111 : if (ret && ttm_debugfs_root)
112 : debugfs_remove(ttm_debugfs_root);
113 0 : if (ret)
114 0 : --ttm_glob_use_count;
115 0 : mutex_unlock(&ttm_global_mutex);
116 0 : return ret;
117 : }
118 :
119 : /*
120 : * A buffer object shrink method that tries to swap out the first
121 : * buffer object on the global::swap_lru list.
122 : */
123 0 : int ttm_global_swapout(struct ttm_operation_ctx *ctx, gfp_t gfp_flags)
124 : {
125 0 : struct ttm_global *glob = &ttm_glob;
126 : struct ttm_device *bdev;
127 0 : int ret = 0;
128 :
129 0 : mutex_lock(&ttm_global_mutex);
130 0 : list_for_each_entry(bdev, &glob->device_list, device_list) {
131 0 : ret = ttm_device_swapout(bdev, ctx, gfp_flags);
132 0 : if (ret > 0) {
133 0 : list_move_tail(&bdev->device_list, &glob->device_list);
134 : break;
135 : }
136 : }
137 0 : mutex_unlock(&ttm_global_mutex);
138 0 : return ret;
139 : }
140 : EXPORT_SYMBOL(ttm_global_swapout);
141 :
142 0 : int ttm_device_swapout(struct ttm_device *bdev, struct ttm_operation_ctx *ctx,
143 : gfp_t gfp_flags)
144 : {
145 : struct ttm_resource_cursor cursor;
146 : struct ttm_resource_manager *man;
147 : struct ttm_resource *res;
148 : unsigned i;
149 : int ret;
150 :
151 0 : spin_lock(&bdev->lru_lock);
152 0 : for (i = TTM_PL_SYSTEM; i < TTM_NUM_MEM_TYPES; ++i) {
153 0 : man = ttm_manager_type(bdev, i);
154 0 : if (!man || !man->use_tt)
155 0 : continue;
156 :
157 0 : ttm_resource_manager_for_each_res(man, &cursor, res) {
158 0 : struct ttm_buffer_object *bo = res->bo;
159 : uint32_t num_pages;
160 :
161 0 : if (!bo)
162 0 : continue;
163 :
164 0 : num_pages = PFN_UP(bo->base.size);
165 0 : ret = ttm_bo_swapout(bo, ctx, gfp_flags);
166 : /* ttm_bo_swapout has dropped the lru_lock */
167 0 : if (!ret)
168 0 : return num_pages;
169 0 : if (ret != -EBUSY)
170 : return ret;
171 : }
172 : }
173 0 : spin_unlock(&bdev->lru_lock);
174 0 : return 0;
175 : }
176 : EXPORT_SYMBOL(ttm_device_swapout);
177 :
178 0 : static void ttm_device_delayed_workqueue(struct work_struct *work)
179 : {
180 0 : struct ttm_device *bdev =
181 0 : container_of(work, struct ttm_device, wq.work);
182 :
183 0 : if (!ttm_bo_delayed_delete(bdev, false))
184 0 : schedule_delayed_work(&bdev->wq,
185 : ((HZ / 100) < 1) ? 1 : HZ / 100);
186 0 : }
187 :
188 : /**
189 : * ttm_device_init
190 : *
191 : * @bdev: A pointer to a struct ttm_device to initialize.
192 : * @funcs: Function table for the device.
193 : * @dev: The core kernel device pointer for DMA mappings and allocations.
194 : * @mapping: The address space to use for this bo.
195 : * @vma_manager: A pointer to a vma manager.
196 : * @use_dma_alloc: If coherent DMA allocation API should be used.
197 : * @use_dma32: If we should use GFP_DMA32 for device memory allocations.
198 : *
199 : * Initializes a struct ttm_device:
200 : * Returns:
201 : * !0: Failure.
202 : */
203 0 : int ttm_device_init(struct ttm_device *bdev, struct ttm_device_funcs *funcs,
204 : struct device *dev, struct address_space *mapping,
205 : struct drm_vma_offset_manager *vma_manager,
206 : bool use_dma_alloc, bool use_dma32)
207 : {
208 0 : struct ttm_global *glob = &ttm_glob;
209 : int ret;
210 :
211 0 : if (WARN_ON(vma_manager == NULL))
212 : return -EINVAL;
213 :
214 0 : ret = ttm_global_init();
215 0 : if (ret)
216 : return ret;
217 :
218 0 : bdev->funcs = funcs;
219 :
220 0 : ttm_sys_man_init(bdev);
221 0 : ttm_pool_init(&bdev->pool, dev, use_dma_alloc, use_dma32);
222 :
223 0 : bdev->vma_manager = vma_manager;
224 0 : INIT_DELAYED_WORK(&bdev->wq, ttm_device_delayed_workqueue);
225 0 : spin_lock_init(&bdev->lru_lock);
226 0 : INIT_LIST_HEAD(&bdev->ddestroy);
227 0 : INIT_LIST_HEAD(&bdev->pinned);
228 0 : bdev->dev_mapping = mapping;
229 0 : mutex_lock(&ttm_global_mutex);
230 0 : list_add_tail(&bdev->device_list, &glob->device_list);
231 0 : mutex_unlock(&ttm_global_mutex);
232 :
233 0 : return 0;
234 : }
235 : EXPORT_SYMBOL(ttm_device_init);
236 :
237 0 : void ttm_device_fini(struct ttm_device *bdev)
238 : {
239 : struct ttm_resource_manager *man;
240 : unsigned i;
241 :
242 0 : man = ttm_manager_type(bdev, TTM_PL_SYSTEM);
243 0 : ttm_resource_manager_set_used(man, false);
244 0 : ttm_set_driver_manager(bdev, TTM_PL_SYSTEM, NULL);
245 :
246 0 : mutex_lock(&ttm_global_mutex);
247 0 : list_del(&bdev->device_list);
248 0 : mutex_unlock(&ttm_global_mutex);
249 :
250 0 : cancel_delayed_work_sync(&bdev->wq);
251 :
252 0 : if (ttm_bo_delayed_delete(bdev, true))
253 : pr_debug("Delayed destroy list was clean\n");
254 :
255 0 : spin_lock(&bdev->lru_lock);
256 0 : for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
257 0 : if (list_empty(&man->lru[0]))
258 : pr_debug("Swap list %d was clean\n", i);
259 0 : spin_unlock(&bdev->lru_lock);
260 :
261 0 : ttm_pool_fini(&bdev->pool);
262 0 : ttm_global_release();
263 0 : }
264 : EXPORT_SYMBOL(ttm_device_fini);
265 :
266 0 : static void ttm_device_clear_lru_dma_mappings(struct ttm_device *bdev,
267 : struct list_head *list)
268 : {
269 : struct ttm_resource *res;
270 :
271 0 : spin_lock(&bdev->lru_lock);
272 0 : while ((res = list_first_entry_or_null(list, typeof(*res), lru))) {
273 0 : struct ttm_buffer_object *bo = res->bo;
274 :
275 : /* Take ref against racing releases once lru_lock is unlocked */
276 0 : if (!ttm_bo_get_unless_zero(bo))
277 0 : continue;
278 :
279 0 : list_del_init(&res->lru);
280 0 : spin_unlock(&bdev->lru_lock);
281 :
282 0 : if (bo->ttm)
283 0 : ttm_tt_unpopulate(bo->bdev, bo->ttm);
284 :
285 0 : ttm_bo_put(bo);
286 0 : spin_lock(&bdev->lru_lock);
287 : }
288 0 : spin_unlock(&bdev->lru_lock);
289 0 : }
290 :
291 0 : void ttm_device_clear_dma_mappings(struct ttm_device *bdev)
292 : {
293 : struct ttm_resource_manager *man;
294 : unsigned int i, j;
295 :
296 0 : ttm_device_clear_lru_dma_mappings(bdev, &bdev->pinned);
297 :
298 0 : for (i = TTM_PL_SYSTEM; i < TTM_NUM_MEM_TYPES; ++i) {
299 0 : man = ttm_manager_type(bdev, i);
300 0 : if (!man || !man->use_tt)
301 0 : continue;
302 :
303 0 : for (j = 0; j < TTM_MAX_BO_PRIORITY; ++j)
304 0 : ttm_device_clear_lru_dma_mappings(bdev, &man->lru[j]);
305 : }
306 0 : }
307 : EXPORT_SYMBOL(ttm_device_clear_dma_mappings);
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